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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05c4042b5885989ed55f09f227bdd6b65d00baa136f51eb5da2cb285e19136fb' 
  AND token = 'CGaOCJOT6QZOLQs+bMp51mgJjeTarnG103qXzZFbnoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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