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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01fc04c918c6d776f1211e9190290ecd73e078a63a841ed7c035526c8dac50a9' 
  AND token = 'IfEuz4I6Z10hQpjiW0GunwRoIUiO2Dv9AdLq8mVec08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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