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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2dd45df4c0219acbf0feccd1a9080da4f7ce26e697f72737911eea9f4ee155ac' 
  AND token = '4Pv1P8tXVEVTfr6760F6nQHnLvhcNr/Lulfbs9Klquo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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