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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adf5c6207cd0c3232e96e8eb058d8994c79b9fb48e1a5d328c4de644cc386283' 
  AND token = 'AY3aP77M+B7BkqOxwbI/EaivYSyiD2XiSaJFkTdZZGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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