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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11886eb95cef1336f642734d2f9ae7efab1b72aba2ecedc2dc42472742a7568e' 
  AND token = 'EydzPRITHFkwJp2/5TdwlPZHrQhbGbPGfSnvvb7eclI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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