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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fd2c435ec47b612415637422dbb86d0c526d0ebfb7de2d6ec5699b43833e86b' 
  AND token = 'HfwV8uw11LuX098cQvbFN9F9986gyZeGuyI1JFzsarw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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