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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82a669cfc2f0c6bb148c26d892260e3da459c32f7270f37317b9ef0f70d80fa8' 
  AND token = 'aLS5lFwaHBFrU7Y3wWNzfrDlbDW+TjoGEG0OUIqebks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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