SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f133d30499cf1a7456d84a59c684f2e35aa5229fe7811f33c3c1e7d2eea8730c' 
  AND token = 'JgPjOy5ThOuxxgqmGAnERLaMPWtTGhghulAgHV9/rB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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