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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58aac9ce271783098ea77d36cb032e1040b523c3059d66511945f1828f735ef0' 
  AND token = 'EMjE/6NRLCFbR0v5Wyx4D0nWpy7PQpr7vgacdxkfaQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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