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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bda6f56850e33604ddec67703dca8488e43b0617720ae67a40456bfb05559194' 
  AND token = 'En0J0y50SqGRfbCbU9BNDIbF/41oWvaNI28iurmKnjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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