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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3acdf457e04c1a7793388cf00a234118e073a2eb772d2a6917fcb1add2645871' 
  AND token = 'edT1nyT0vbKKV1njwXsTC+JjfLaVL9Dde8GGFDi5c7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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