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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac584f7160171c7a240621cd0001724f4e6d279ec20ca0f629d5bc64e346b1cf' 
  AND token = '09dwxpzY9aAVG/PNG04HiVkuKVKGbko0dwbyEieROX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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