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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dc51d54cad97b7b94d508fbf30652ed7550393c5a40c484cc67f5755eeb6b0b' 
  AND token = 'GSyD2y43oYzwFR8Q9OCT/Ml37Sofnop39RlofBJmS8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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