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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '619000753a8d57692d6e813b91ce9deab41e0b8e29be9e43fcfd1c7abdbc947b' 
  AND token = 'kQvxnMI8wZ9WtDPnD9b7PQwT06n2fmaCjUkC1KD84n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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