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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '217a2a999ee51854ec4b57d400ff80bf93e860c72f01c4ae3178977934cc5efe' 
  AND token = 'lxemuOrO47JNvhHxaVk8tg+6Lk+y4n7b81+YO2BFeCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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