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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43ea953e6612c7da5cb9c64a403d13dbb8be92dd8b14e3234aa76d4745472c34' 
  AND token = 'APFdP1MNuz44xjUFO2+gOwpBhJJ5t26J6ZYdL432aHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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