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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7394131702795683dfcb4c5329f353e70a5ca28b6e8b0842d03382a3e88d58e4' 
  AND token = 'DJNWSjyelFYZcolE3PTHDuP3D6QpJAGSxIr6c1v5iC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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