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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1483e4d76a7293df4b1983db9aa4a6eb680670bc8a0427fd132f2a76e6fa94d2' 
  AND token = '6HARiShgNrpMOt7/xzioYRCyYOCNmWMnzMl91nAvD2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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