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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea5cb6e56528d2dd17ab9c2d663d7e6db950adf195a99f1ad9f4f68c3ddf48cb' 
  AND token = 'byS9fQoMk7riQns1pGFVSgoKJTvjkKCpFEEk90F/mgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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