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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97c3f527b5311ccb012a9b3cda545acc5c792cccebd9bd8150d900afea23de56' 
  AND token = 'GIxX99Z6GpeIOy2HSRs/e4Gs4OQ4X5RYtR6LpiBYHBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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