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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '629272f275e9a0286e99b8ae2f13459f40b7dc38109c224d9dd16aa9ae79d3b3' 
  AND token = 'v7re7MryHvn20nAQp7nqaosi4CRbKZ/UPNhAMyxmgsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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