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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cb7f1e1868ca87017d06a5a386ffcceeb209c82a0604b7df59d18c0fb92219e' 
  AND token = '1xkuXYcS05xJl3pMFlsHU97dIPUmdTAkwnj4t8tz+lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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