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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3373590ab69571c0ed44529f0e210c67b67533b8c396787050fcdd4a131ae00b' 
  AND token = 'koWHpmdGiOF6kbqcTuRxbg6d49d+PVhUcZ0m0fJPDgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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