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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8625602dc711c7022c9fa349f3165e64a3fd88e9bdb6da364f511cbeaa9ac62d' 
  AND token = 'gEwz5Hkoga/rk9yS0mdieMMjrIEwsamGRI4en5aa0xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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