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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a19f82321a318892005d280c99a942b1db3bd6cc3fbcb7aeea0a16295e76da5a' 
  AND token = 'ejuxKEpIZQUTYTHn9uYdycs2O7zACTWY9Zwrd6YGT+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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