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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cc46d8b9a1becdcad577dc8ebce3dcebfd67455c48b17d92d8ccc61defe6ebf' 
  AND token = 'PdQxgZLcAVxyPY7pFPgvWBJvi6ZHdQX0smRzcoy5EOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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