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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8171cd5d269a8e8604ed98274f3335f7dd31fa07488ec8e01ac6668018d6ae1' 
  AND token = 'tOLVlTMl/wM2G5ViYFV+EH+NIHPDpGTfhqKAxpcOewA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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