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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56003c960e89cd42b0808bae23676b4bbd98da95b0b7654fcf7f82b20cbe7058' 
  AND token = 'O4x4VMTirbuSj5PRBPSYoqTCI5lolIlj4QVsl+M0LBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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