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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dbbeb48fd94879f1e51c0b91ce83b64b7b6bee3f8d3fec4389c3f631b3f0eb7' 
  AND token = 'NDk+N61ZkLpnW4gqajtA2lDyeNIExn0/wIkH1CxgPX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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