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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d3762655a3f4b80d3c84c49c5a087c779349e2260446ef9089b9d03d2990d05' 
  AND token = 'vvuj0wyRoJgiQ6UQ2nt9cA4vCgb8kJ17iFSfSUg9wJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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