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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '064fe6d972be3ee511ad016c3fc5ebace07f92abb28b5e2fae6354b8c302c1e8' 
  AND token = 'Dw2cELHAJmsq28sOKOvL6A8U691AaaLWiiykhhZ9N4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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