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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6720170c945407e7f0c346b8486ae4f2e1571fda4e8b636a2b1ecc0b18670206' 
  AND token = 'ztZaVbwMopwLAn58RhLE+496MFkJSbruZIixYbHuyEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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