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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95ed459521840fd4852046b9d0210c3b500f95b5dabda226477a2deade4b81bb' 
  AND token = '60+GgcSLMqMV/Oc8tpBNVVBvYjE48gNfRTs8bMYMQWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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