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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d2b812c4116af9340599a2df6543e26f4b1793770fdd87d67fe54f0b57071e8' 
  AND token = 'S59Oygw9U0lOdvDrlwy3kvcy8JTKBMYK0OUZuDC94DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}