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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2014823995b703c44230709306ce50b691ecd64a4f3e1216d4c814ddb4eaf0dc' 
  AND token = 'FNBLEEl5nfEu7Bk2h/p4LfFhSZor/YjF870WggEREJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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