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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fff33f8654e93121336d77ce547d23860138b10eb82bc79e96c5464e076e89e2' 
  AND token = 'zqyGIsTmokHUcPEAIkA2+29W/38KCPhy4n9//f/z/io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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