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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d202338b3cc6e89f965d6e90b5162f1e29a1098c50cb6132c6355b5a138462f' 
  AND token = '7ScFC/bdk8lSe8pSXFkfIjfhOrGZsx+qT2OHieosx1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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