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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32420bf876145548490a8b6c5525e8234dba825156be1a8d8cdd4477c0e32296' 
  AND token = 'Y0yjdTLCCj09zt9mLGCWlELdsR5DYYxKvAtKXIZbk1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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