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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5b8d69d09e3a31468a60bf9cadd3b5d2b5ec7a6d5cac7d2f176db9475c1fec8' 
  AND token = 'NiCpXvNnAHua0yk/kguayyoegvwMceWLqtA9/j+jNRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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