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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1925892262cdd7f741cd9ebea64d9caf43d64aaab1c21fd16d2ebf99e2294c4' 
  AND token = '5cMLz4rghxj7htUkXLJ4BCE4L/M8HspqTxxoNL+Ykao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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