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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e79d346e5d900f73d582bd51d83b1a82279b50b44e94e8f7f6e3aecdf27ecd7d' 
  AND token = 'Cx9gcskAVFQUu92U9O8bE+aaz1l1AWMTBl1DLgMjItA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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