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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3cd936d1b30c9afa6615766217ae645ae670cc51ded800fb62158274aec5106' 
  AND token = 'kN+sVmGTJhGZFB9dKWAHR9AAD1T1LSfFi/NINiuRMh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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