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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b0ddd704e0ce3ff91e1af7077fa09cefe15e0b9704b732520f2ff8fc8d8abc6' 
  AND token = 'pTdEftgebKkbTHRrPEXUiZAtfaeUwDFUsQhXALUYyyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00174

JSON explain

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