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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd13c6ead5c09455f81623e99ccca5bf41ade2a5c9141307c492a21723c31b12' 
  AND token = 'JZxCI4IgR7l/S2xeoUIpCjEtkrVM8tBHA44m5I4jJGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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