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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77ae8693c80a3fb353c30d49a9391aa462f66c3bbbc2fe26c61dc50a8223dd91' 
  AND token = 'L2bOS57Q3owstAHd+ed6o5axnlp6HvqwH7Ov3pBll7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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