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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '143e310857aec7ae6e4d486db3819681bd4c8b4a11569cdcf14982b00a48cf46' 
  AND token = 'iwbzdO9UAl5jS+H38iFFGjg42R29MoXeY51Vtva3TPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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