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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91464a6cc6971375fb22dad7612a224d4301668c9eb85e589dc5e4a526516ea7' 
  AND token = 'RgdBICs2Ii+5vIV0Zw/U9OLHN8dxZba3ok3Q554PrSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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