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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ad770ff62d77127d982231924ab101a599b50d4939a032b4e8f901c8c2b1c00' 
  AND token = 'vnAmentNclu74pXlhY0yfYJIU33XLqFfc1455U/7LGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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