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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '494a5133661bfac48a71a1e4cee3711e887893a3a04be3eeb66432280516f233' 
  AND token = 'f8acW9yWsgTaJQrFcGqfxnqj99hSP3F6sR15SEf0uR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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