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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c69d731ed4e9430913e7a867c9651e5eec3fbb33d9fe828a6b767fe98f7aba0' 
  AND token = 'IoSPsm7nXFsUx8fNgYoCRruiyjuYwUYj/xfjSBos1oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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