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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd241c5c3d4fb13b2a877e8fe921ab68c4ed4257a7c2ee610c7b8eccc3187adb5' 
  AND token = '1mghptTh6/crVgZYfEUEdaRS63XbBbNfcY30oq19dCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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