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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b8b58e5878adc890360b88fe2f31b96ffb5d7f6909b3d2ccb05905ba1751feb' 
  AND token = 'n0EY8xDxtjLTGEgzemspJi9ienDY3BAaGDkwJma1+mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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