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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aee7614fbd2304cd26b07ee06fccdd61bea1572723966f7f24d3794e0366faa9' 
  AND token = '/wywjreiXfNtqHavCBJa8s3xwKO2OTvYI99tLbC3JaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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