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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08b992b90d932b29a02f9b189b5f13b507c4eb85b54e2a8579df2f417aa22eff' 
  AND token = '61nqE3iUNeqhUGCg9eMuF9ccSrl/6J+10hgTZrhPt7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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