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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac00e16918d26a5c9db2473f520bf2932be65e4cfb91642f6607bd68ef51bd79' 
  AND token = 'NocyNBvkIvm9mMPJ1EjVS9r8diUmt/W16pd4TEJScrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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