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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4dae2b86e1cd0dd870107e857b5382e624bf8433d8597b1772c2bbdf48a9b23' 
  AND token = 'jD74e10uXhyn8ZuPF0XV8ta6Xbjdj8C+Ww1yIGOTABU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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