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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd07cba005b37fb03329dc29be1fabc6cee4666f9a70da10fb1dee41dc6b41e9' 
  AND token = 'Or5RDG1pnserijhnvsP8gB0UDusyWhr/138/4lJHijk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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